
Bright citrus, smoky spices, and a hit of garlic come together in a marinade that transforms flank steak into something genuinely crave-worthy. The combination of fresh orange juice, lime juice, and coconut aminos does the heavy lifting here — tenderizing the meat while building layers of flavor that taste like they took way more effort than they did. Avocado oil is the only fat used throughout, both in the marinade and to sear the steak, making this completely free of industrially processed seed oils without any compromise on that gorgeous, high-heat crust. A cast iron skillet cranked to high heat is the secret weapon — it gives you a deep, caramelized sear that rivals anything off the grill. The smart move of reserving a portion of the marinade before it ever touches raw meat means you get a punchy finishing drizzle that ties every slice together. Resting the steak and cutting it thinly against the grain ensures each piece is tender and juicy rather than chewy. Serve it with lime wedges and a scatter of fresh parsley, and you've got a weeknight dinner that looks and tastes like a serious occasion.
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In a medium bowl, whisk together the coconut aminos, orange juice, lime juice, 2 tbsp avocado oil, garlic, cumin, smoked paprika, black pepper, salt, red pepper flakes (if using), and cilantro until combined.
Reserve 3 tbsp of the marinade in a small bowl and set aside — this portion has not contacted raw meat and will be used as a finishing sauce. Place the flank steak in a large zip-top bag or shallow dish and pour the remaining marinade over it. Seal or cover and refrigerate for at least 2 hours and up to 8 hours.
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